if not len(sys.argv) > 1:

print('need a dir name')

exit()

with Ow(sys.stderr) as ow:

rp = Rp(sys.argv[1:], ow)

lengths = []

replays = rp.read_replays()

for replay in replays:

length = replay.get('ext', [{}])[0].get('common', {}).get('duration')

if length:

lengths.append(length)

average_length = mean(lengths)

minutes = int(average_length / 60)

seconds = str(int(average_length % 60)).rjust(2, '0')

print(f'\n{len(lengths)} replays:')